ReefKeeper64
Wanna be a reefkeeper
To grow live microalgae you are going to add high levels of nitrates and phosphates to the algae culture, and will therefore constantly be injecting the system with a new stream of N&P.
If you feed the rotifers with concentrated microalgae, the majority of N&P have been removed through centifugal harvesting, leaving just the food value inside the microalgae cells. This will result in a much lower introduction of N&P into the system, and less maintenance of removing them from your system.
What exactly is concentrated microalgae? Spirulina powder perhaps?